公开(公告)号：DK281790A

公开(公告)日：1990-11-27

申请号：DK281790

申请日：1990-11-27

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F

IPC: H04L27/38 ,  H03J7/02 ,  H03L20060101 ,  H03L7/00 ,  H03L7/087 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227

Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.

公开(公告)号：CA2003688A1

公开(公告)日：1990-06-16

申请号：CA2003688

申请日：1989-11-23

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F M

IPC: H03L7/095 ,  H03J7/02 ,  H03L7/08 ,  H03L7/087

Abstract: There is provided a method of and apparatus for Automatice Frequency Control (AFC) of pure sine waves (PSW). It is characterized by discriminating to detect frequency differences between a received pure sine wave and a reference frequency (20), integrating (30) the frequency differences to average the differences, and adjusting (40) the reference frequency (80) to eliminate the frequency difference. It is further characterized by digitizing, in quadrature, the received pure sine wave (70), mixing (50) the received pure sine wave with a complex sinusoid to translate the pure sine wave to baseband, quadrature filtering (60) the mixed sine wave, cross-product discrimination (20) to detect frequency differences between a received pure sine wave and a reference frequency, integration (30) the frequency differences to average the differences, selectively (100/110) calculating the mean/variance (90) between the pure sine wave and the reference frequency, and adjusting (40) the reference frequency of a Voltage Controlled Oscillator 80 to eliminate the frequency difference.

公开(公告)号：FI884941A0

公开(公告)日：1988-10-26

申请号：FI884941

申请日：1988-10-26

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  WANG CHI-FEI ,  RABE DUANE C ,  LABEDZ GERALD PAUL

IPC: H04L27/22 ,  H04B7/185 ,  H04B7/26 ,  H04J3/00 ,  H04L7/04 ,  H04B

公开(公告)号：FI884940A0

公开(公告)日：1988-10-26

申请号：FI884940

申请日：1988-10-26

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  BORTH DAVID E

IPC: H04B7/005 ,  H04L27/38 ,  H04B7/01 ,  H04B7/26 ,  H04B

Abstract: The method and apparatus for rapid phase acquisition and random radio channel phase error compensation for a TDMA QPSK receiver is disclosed. Received quadrature signals having a known synchronizing sequence transmitted on one of the vectors is correlated to a local replica of the sequence. The output correlation detection signals are held for the duration of the TDMA timeslot and multiplied by the received quadrature signals to produce two pairs of products. The mutually exclusive product pairs are summed to recover data having the random phase error compensated.

公开(公告)号：DE19712830B4

公开(公告)日：2005-12-08

申请号：DE19712830

申请日：1997-03-26

Applicant: MOTOROLA INC

Inventor： LING FUYUN ,  BORTH DAVID E ,  FRANK COLIN D ,  RASKY PHILLIP D ,  KEPLER JAMES F

IPC: H04B1/707 ,  H04B7/005 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L25/02 ,  H04J13/02 ,  H04B7/216

Abstract: A receiver circuit (400, 500) receives a spread spectrum communication signal, such as a DS-CDMA signal, including a pilot channel and including a power control designator. The signal is despread and decoded. The pilot symbols on the pilot channel are provided to a channel estimator (408) for estimating the channel phase and channel gain of the communication channel. This estimate is provided to a demodulator (422) for demodulating the traffic channel symbols. The pilot symbols are provided to another channel estimator (410) for estimating channel phase and channel gain for the power control designator. This estimate is provided to a demodulator (424) for demodulating the power control designator. The traffic channel symbols are delayed a predetermined time in a delay element (420) before demodulating. The power control designator is delayed a short time or not at all in a short delay element (418) before demodulation.

公开(公告)号：DE69030892T2

公开(公告)日：1998-01-02

申请号：DE69030892

申请日：1990-03-23

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F

IPC: H04L27/38 ,  H03J7/02 ,  H03L20060101 ,  H03L7/00 ,  H03L7/087 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227 ,  H03L7/093 ,  H04B7/212

Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.

公开(公告)号：AT154481T

公开(公告)日：1997-06-15

申请号：AT90105506

申请日：1990-03-23

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F

IPC: H04L27/38 ,  H03J7/02 ,  H03L20060101 ,  H03L7/00 ,  H03L7/087 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227 ,  H03L7/093 ,  H04B7/212

Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.

公开(公告)号：FR2679085B1

公开(公告)日：1996-08-02

申请号：FR9208044

申请日：1992-06-30

Applicant: MOTOROLA INC

Inventor： MUELLER BRUCE D ,  BAUM KEVIN L ,  BORTH DAVID E ,  RASKY PHILLIP D ,  WINTER ERIC H

IPC: H04B3/04 ,  H04B7/00 ,  H04B7/005 ,  H04B7/08 ,  H04L1/02 ,  H04L25/06 ,  H04L27/01 ,  H04L27/22 ,  H04B17/00

Abstract: A system and method for correcting for Rayleigh interference of a signal transmitted upon a multi-path channel. The system adaptively calculates values of channel gain and noise variance of the channel upon which the signal is transmitted, and generates signals indicative of such calculations which are supplied to a decoder. The system may be utilized to form a portion of a coherent, or noncoherent receiver which receives encoded and differentially-encoded signals.

公开(公告)号：GB2292293A

公开(公告)日：1996-02-14

申请号：GB9521138

申请日：1992-05-07

Applicant: MOTOROLA INC

Inventor： MUELLER BRUCE ,  BAUM KEVIN L ,  BORTH DAVID E ,  RASKY PHILIP D ,  WINTER ERIC H

IPC: H04L25/06 ,  H04L27/22 ,  H04L27/233 ,  H04L27/06 ,  H04B7/005

Abstract: A receiver for decoding a differentially-encoded communication signal transmitted thereto over a communication channel comprises means 1390, 1420 for demodulating the differentially-encoded communication signal, sampling units 1398, 1428 for sampling at least portions of the demodulated received signal, and a decoding metric estimator 1450 coupled to receive the sampled signal. The decoding metric estimator includes a delay element 1266, a complex conjugate converter 1270 and a mixer 1274 operative to mix the sampled signal and the complex conjugate signal to form a metric estimation signal. A soft decision decoder 1470 receives and decodes the metric estimation signal. A symbol detector (1226, Fig. 9) may be connected between the delay element and the complex conjugate converter. The symbol detector may comprise a magnitude setter (1220) and a phase quantizer (1224).

公开(公告)号：FR2696602B1

公开(公告)日：1995-11-17

申请号：FR9311649

申请日：1993-09-30

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  HAUG JOHN R ,  RASKY PHILLIP D

IPC: H04B7/26 ,  H04W74/04 ,  H04B7/212